package com.atguigu.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * 说明
 * 1.SimpleChannelInboundHandler是ChannelInboundHandlerAdapter子类
 * 2.HttpObject客户端和服务器端相互通讯的数据被封装成HttpObject
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    //channelRead0读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {
        //判断msg是不是httpRequest请求
        if (httpObject instanceof HttpRequest){
            System.out.println("pipeline hashcode" + channelHandlerContext.pipeline().hashCode()
                    + "TestHttpServerHandler hashcode" + this.hashCode());
            System.out.println("httpObject类型=" + httpObject.getClass());
            System.out.println("客户端地址" + channelHandlerContext.channel().remoteAddress());
            //获取到HttpRequest
            HttpRequest httpRequest = (HttpRequest) httpObject;
            //获取uri，过滤指定资源
            URI uri = new URI(httpRequest.uri());
            if("/favicon.ico".equals(uri.getPath())){
                System.out.println("请求了favicon.ico，不做响应");
                return;
            }

            //回复信息给浏览器
            ByteBuf buf = Unpooled.copiedBuffer("hello,我是服务器", CharsetUtil.UTF_8);
            //构造一个http响应，即httpResponse
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,buf.readableBytes());
            //将构建好的response返回
            channelHandlerContext.writeAndFlush(response);
        }
    }
}
